The handy man who has a gasoline engine in his shop and which exhausts outside into the atmosphere may silence that disturber of peace somewhat in the manner shown in the accompanying illustration. It removes the sharp penetrating quality of the noise without causing any back pressure. The end of the exhaust pipe, which must be vertical in order to prevent clattering of the segments, is split into eight parts by means of longitudinal cuts made with a hacksaw. The cuts should extend for three or four feet in the pipe.

Fig. 155 - The slotted exhaust pipe serves as a muffler.